当前位置: 首页 > 文章 > 用岭估计估测以分类为前提的森林蓄积量 东北林业大学学报 2014 (9) 39-42+57
Position: Home > Articles > Forest Volume Estimation on the Premise of Classification by Ridge Estimate Journal of Northeast Forestry University 2014 (9) 39-42+57

用岭估计估测以分类为前提的森林蓄积量

作  者:
王艳婷;李崇贵;郝利军
单  位:
陕西煎茶岭镍业有限公司;西安科技大学
关键词:
复共线性;岭估计;地类;蓄积量估测
摘  要:
为克服自变量间多重相关性对森林蓄积量估测的不利影响,采用岭估计建立估测模型。在确定岭参数时,分别试验了岭迹法、方差扩大因子法、Hoerl-Kennard法和预测残差平方和法,对不同地类分别建立蓄积量估测方程。根据建模样地的蓄积量拟合残差和预报样地的蓄积量估测偏差分别计算中误差,利用残差中误差(^δR)和预报偏差中误差(^δF)构造评价函数0.5(^δR+^δF),并测度岭参数的优劣,进而确定监测区域的估测模型。结果表明:当影响蓄积量估测的自变量间存在复共线性时,分类建立模型的精度明显优于统一建模的精度。
译  名:
Forest Volume Estimation on the Premise of Classification by Ridge Estimate
作  者:
Wang Yanting;Li Chonggui;Hao Lijun;Xi'an University of Science and Technology;Shaanxi Jianchaling Nickel Industry Co.Ltd.;
关键词:
Multicollinearity;;Ridge estimation;;Land category;;Forest volume estimation
摘  要:
For overcoming adverse effects of the multiple correlations between the independent variables on forest stock volume estimation,we used ridge estimation to establish estimation models. In determining ridge parameters,we respectively tested ridge trace method,variance inflation factor method,Hoerl-Kennard method and predictive residual sum of squares,and established stock volume estimating equations for different land types. According to the stock volume fitting residue of modeling plots and the stock volume estimation bias of prediction plots,we calculated mean square error,construct evaluation function by using the residual error and the prediction error,measured the pros and cons of ridge parameters,and determined the estimation model of monitoring area. When there is multicollinearity between independent variables that affect stock volume estimation,the precision of classification modeling will be significantly better than unified modeling.

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